Math Vocabulary:
Prime Numbers are numbers with EXACTLY TWO factors, one and itself.
Seven is a prime number because the only factors of 7 are 1 and 7. Other examples of prime numbers: 2, 13, 19, 59, 73.
Composite Numbers are numbers with MORE than TWO factors. Nine is a composite number because it has more than two factors: 1, 3 and 9.
Interestingly, the number one is not prime nor composite.
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